One would think that, given the advances in GPS and mapping, that any self-driving cars need to stop 'looking' at traffic signs and have the relevant information already encoded in their maps.
Driving in Spain is fun with GPS. There's the "Where the f**k, did that roundabout come from? It's not on my satnav!" and there was a stretch of road where I would have to do the complete opposite of the satnav.
"Turn left"
"No, you stupid bitch, there is a no-entry sign, I have to turn right"
"Turn around now"
"How???? I'm on a dual carriage way with a big f**k off concrete barrier down the middle - wait till we get to the roundabout signposted ahead!"